3 votes
Accepted

Filament Guides Drag

For an easy test, try manually pulling the filament through the U-loop of guide tube. How hard is it to pull through? It should only take 1-2 lbs of tension at most. Then do a "tug test" on the ...
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  • 6,436
2 votes

What are the appropriate ranges of gear ratios for 1.75 mm and 3 mm filament extruders?

This basically depends on the torque your stepper can produce! A high torque stepper (the bigger the height of the stepper the more powerful the stepper) can push filament with much more force than a ...
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2 votes

What are the appropriate ranges of gear ratios for 1.75 mm and 3 mm filament extruders?

$ \frac{(2.85\ mm)^2}{(1.75\ mm)^2}=2.65$ which is the reduction you would want assuming a 1.75 is direct drive. In this answer I am comparing the amount of filament flowing though the extruder by ...
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  • 2,198
2 votes

Good methods to clean extruder gear (hobbed) from filament pieces?

If your gear skips at the same place each time I have found on my machine that the gear does not fit the motor shaft properly and has a larger gap between the gear and the idler roller. Check to see ...
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  • 191
1 vote

Dual extruder with gear shifting

That is perfectly viable these days in Marlin firmware, there are options for setting this up using the configuration file, e.g.: ...
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1 vote
Accepted

What are the effects of backlash from a geared stepper motor used to drive a filament extruder?

During normal extrusion backlash has no effect. During retraction you can perfectly compensate by increasing retraction length slightly. Backlash cannot be taken into account for pressure advance, but ...
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  • 3,776
1 vote
Accepted

When to use an anti-backlash bolt for a Z drive gear?

First of all, let's look at the geometry: We have a static XY and changing Z on our build plate. This mitigates several problems we might have faced in a different setup, mainly that our lead screw ...
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  • 19.2k
1 vote

Good methods to clean extruder gear (hobbed) from filament pieces?

I use an air bulb to clean dust out of teeth, but the clicking sounds like the stepper has too much mechanical load so i am guessing there is something solid stuck at that point. Poke it off with ...
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1 vote
Accepted

Good methods to clean extruder gear (hobbed) from filament pieces?

I mostly use a tooth brush for that kind of problem
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  • 136
1 vote

Good methods to clean extruder gear (hobbed) from filament pieces?

If you are able to remove the gear, as I suspect you can, a useful tool is the file card. It resembles a flat hair brush but the bristles are short wire, very stiff. In traditional use, it removes ...
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  • 9,782
1 vote

Filament Guides Drag

I have a few hundred printing hours on a Monoprice Dual Extrusion, which is essentially the same thing. I've had a couple random issues that lead to filament stripping by the extruder motor: Clogs (...
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  • 121

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